Tkaiw-coittrol mechanism



1.1. MURRAY.

TRAIN CONTROL MECHANISM. APPLICATION FILED JUNE 30, I920. Q

' Patented Feb. 22, 1921.

' 2 SHEEIS-SHEET 1- gvwenfoz Joseph J.Muwa1 J. J. MURRAY.

'TRAlN CONTROL MECHANISM.

4 APPLICATION FILED JUNE 30, .1920. 1,369,698.

Patented Feb. 22,1921.

2 SHEETSSHEET 2 gvwv/ntoz J nsaph JMurggg attozweqv UNITED STATES JOSEPH JOHN MURRAY, or wEsrALBAN NEW YORK.

TRAIN-CONTROL MECHANISM.

. Application filed June so, 1920. Serial No. 393,036.

To all whom it may concern:

Be it known that I, JOSEPH J. MURRAY, a citizen of the United States, residing at W'est Albany, in the county of Albany and State of New York, have invented certain new and useful Improvements in Train- Control Mechanism, of which the following is a specification.

r This invention relates to automatic stops for railroads and one of the prime objects of the invention is to provide an improved means for preventing an engineer from running past a stop signal, thereby eliminating the danger of rear end collision.

Another object of the invention is to provide an improved trip member. carried by a train, which is adapted to be disposed in the path of the semaphore arm, whereby when the trip member is set in operative position, the same will engage the semaphore arm when the same is set ina stop position, the trip mechanism having means for opening the train pipe, and thereby permitting' the application of the train brakes.

A further object of the invention is to provide an improved means for holding the trip mechanism in operative position against accidental displacement so that operation thereof by wind pressure will be eliminated. A still further object of the invention is to provide a novel valve mechanism and operating means therefor for the train pipe whereby the bleeding of the train pipe will be permitted when the valve mechanism is A still further object of the invention is to provide an improved automatic train stop of the above character which is durable and efficient. in use, one that is simple and easy to manufacture, and one which can be in= corporated with existing locomotives or placed. thereon at the time x of manufacture;

lNith these and other objects in view, the invention consists in the novel construction, arrangement and formation of parts as will be hereinafter more speoifically'described, claimed and illustrated in the accompan ing drawings, forming a part of this specifcation, in which drawings:

Figure 1 is a side elevation of a locomotive showing the improved automatic stop mechanism attached thereto, parts of the locomotive stop mechanism being shown in section.

Fig. 2 is a transverse section through a Specification of Letters Patent. Patgni ed Feb,

portion of locomotive showing the trip section connected thereto and the semaphore arm set in a stop position.

Fig. 3 is an enlarged fragmentary ver-' tical transverse section through a portion of the locomotive and trip mechanism.

Fig. 4' is an enlarged fragmentary v'e rtlcal transverse section through a portior'i of the trip mechanism, showing the valve structure utilized for bleeding the train pipe.

Referring to the drawings in detail,- wherein similar reference characters desig nate corresponding parts throughout the several views, the letter A generally indicates a locomotive of the ordinary or any preferred construction, B, the improved automatic stop mechanism which is adapted to V be actuated by the semaphore signal- 'strn'cture C.

As shown the locomotive A is of the ordinary or any preferredtype and is provided with the usual type of air brake construe tion D and the train pipe 5 thereof is provided with a vertically disposed branch pipe 6 which extends through the upper wall of the locomotive cab designated by the numeral 7. The automatic train stopping mechanism B is carried by the" upper wall 7 of the cab of the locomotive A and is adapted to be disposed in'the path of a semaphore mechanism C. The semaphore" mechanism C is arranged alongside of the p railroad track E inthe ordinary manner and includes thes'upporting standard 8 andthe semaphore arms 9 and 10 which are adapted to be actuated in any preferred manner; The semaphore arm 9 constitutes the stop signal and is provided with a dc pending right angul arly extending leg 11, and when the arm 9- is disposed in a stop position the leg 11 will be disposdin the path ofthe' automatic stop mechanism B.

The automatic stop mechanism B includes preferred manner to the top wall 7 of the cab of, the locomotive. The portion of the shaft located intermediate the bearing 16 and the bearing brackets 13 is formed square in cross section as indicated by the numeral 17 and these faces form bearing members for engaging the upper surfacesof'the elliptical springs 15 which serve as means for holding the shaft against accidental rotation. The branch pipe 6 of the train pipe 5 terminates in a cylindrical valve casing 20 which receivesa cylindricalportion 21 of the rota table shaft 12. The valve casing 20 is provided with a pair. of diametrically opposed inlet and outlet ports 22 and 23 and the portion 21 of the shaft 12 is provided" with a diametric way 24 which is adapted to aline with the ports 22 and 23 when the shaft 12 is turned inva certainpositioni ,The shaft 12 has secured thereto in any preferred manner, a pair of trip members 25 and 26 which are disposed adjacent to tl'lQgSlClG Walls ofthe cab of the locomotive. These tripmembers are so arranged as to engage a-semaphore arm whether the same is positioned on the right or left handside of-a railway track. As shown each of the trip members 25 and 26 includes a rectangularframe having a pair of arms 27 and the cross braces 28. e

In operation of the improved device the trip ,members 25 and 26 are normally disposed in a vertical plane which positions the way 24 formed in the shaft 12 at right angles to the ports 22 and 28. Vvhen it is desired ,to stop the train the semaphore arm 9 is positioned at right angles to the supporting post 8 which disposes the leg 11 directly in the path of the cross braces 28 carried by one .of the trip members 25 and 26. When the locomotive passes the semaphore mechanism the leg 11 of the semaphore arm 9 will engage the braces 28 and rotate the shaft 17 substantially a quarter of a revolution against the tension of the elliptical springs 15 which will position the way 24 in engagement with the ports 22 and 23. This will permit the train pipe 5 to be bled and thus set the brakes which will effectively stop the motion of the. train. The elliptical springs 15 are so arranged as to hold the locomotive is going in a forward or a reverse direction.

From the foregoing description it can be seen that an automatic train control mechanism has been provided which is of exceedingly simple and durable construction and which will effectively prevent an engineer from running by a stop signal.

Changes in details may be made without departing from the spirit or scope of this invention; but,

I claim:

1. An automatic train control comprising an air brake valve including a cylindrical casing having an outlet port therein, a rotatable shaft mounted in said casing having adiametrically extending way therein, trip members carried by the shaft, and springs arranged to engage the shaft to normally hold the same against accidental rotation.

2. An automatic train stop compising an airbrake' valve including a cylindrical casing, a transversely extending shaft rotatably mounted in said casing having adiametrically extending way, a radially extending trip member carried by the shaft, portions of the shaft being formed square in cross section, and elliptical springs arranged to engage the squared portion of the shaft.

3. An automatic stop for trains comprising an vair brake valve, a casing for the valve, a rotatable shaft mounted in said valve havinga diametrically extending way, radially extending trip frames rigidly carried by the shaft, portions of the shaft being formed square in cross section, and stationary elliptical springs arranged to frictionally engage the squared portions of the shaft. 1. In an automatic stop mechanism for trains, the combination with a brake valve valve casing and provided with a diametri cally extending way, portions of the shaft being formed square in cross section, sta tionary elliptical springs arranged to frictionally engage the squared'portion of the shaft to hold the same againstaccidental rotation. and rectangular shaped. trip members rigidly carried by the transversely extending shaft and arranged to be disposed in the path of a semaphore arm.

' JOSEPHJOHN MURRAY. 

